| 摘要 |
Heat exchanger and continuous piping to be shaped for the making of heat exchangers with a tubular section (1) with a finning (2) directly obtained from the lump so that said finning (2) may eventually be sheared (2') in the piping portions which are not concerned with the respective finnings (2). Thus the costs are reduced, the use is universalised, the production is simplified, different heat exchanger shapes are possibly obtained and the thermal yield is improved. |
